Light tower



FIG. 1 is a left side elevation view of a light tower incorporating our new design, with the right side being a mirror image thereof;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines in FIGS. 1-5 show the environmental structure only and form no part of the claimed design. 

The ornamental design for a light tower, as shown and described. 